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Edentulina moreleti 

Scope:Global
Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_offStatus_en_onStatus_cr_offStatus_ew_offStatus_ex_off

Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Streptaxidae

Scientific Name: Edentulina moreleti
Species Authority: (Adams, 1868)

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2009
Date Assessed: 2006-01-11
Assessor(s): Gerlach, J.
Reviewer(s): Miller, R.M., Pollock, C.M. & Seddon, M.B.
Justification:
A very restricted species, this snail has an EOO of 5 km² and an AOO of 4 km², and is known from only 2 locations. Within this limited range, invasion by Cinnamomum verum plants is an ongoing threat, resulting in habitat degradation.

Geographic Range [top]

Range Description:This snail species is endemic to the Seychelles islands of Mahé and Silhouette, and is found in an elevational band from 540-600 metres above sea level. Its area of occupancy (AOO) is estimated to be only 4 km², while its extent of occurrence (EOO) is only 5 km².  However, E. moreleti was last recorded on Mahé in 1972, despite surveys looking for this species since then, it has not been found. 
Countries occurrence:
Native:
Seychelles (Seychelles (main island group))
Additional data:
Estimated area of occupancy (AOO) - km2:4Continuing decline in area of occupancy (AOO):No
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:5
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:2Continuing decline in number of locations:No
Extreme fluctuations in the number of locations:NoLower elevation limit (metres):540
Upper elevation limit (metres):600
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The population was estimated at 84,000 individuals in 2005.
Current Population Trend:Stable
Additional data:
Number of mature individuals:84000Continuing decline of mature individuals:No
Extreme fluctuations:NoPopulation severely fragmented:No
Continuing decline in subpopulations:No
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:Restricted to high forests from 540-600 m, this snail is found in the axils of Dracaena reflexa and Pandanus hornei plants. It is the only streptaxid known to be herbivorous, feeding on algae and detritus. An ovoviviparous species, it produces eggs but retains them inside the female's body until hatching occurs.
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes

Threats [top]

Major Threat(s): This snail is threatened by habitat deterioration, caused in the past by small-scale wood plantations and currently caused by invasion by Cinnamomum verum plants.

Conservation Actions [top]

Conservation Actions: No conservation actions are in place. Legal protection of Silhouette island is required to protect the main popualtion.

Classifications [top]

1. Forest -> 1.6. Forest - Subtropical/Tropical Moist Lowland
suitability: Suitable  major importance:Yes
1. Land/water protection -> 1.1. Site/area protection
2. Land/water management -> 2.1. Site/area management
2. Land/water management -> 2.2. Invasive/problematic species control

In-Place Research, Monitoring and Planning
  Action Recovery plan:Yes
  Systematic monitoring scheme:No
In-Place Land/Water Protection and Management
  Conservation sites identified:Yes, over entire range
  Occur in at least one PA:No
  Percentage of population protected by PAs (0-100):0
  Area based regional management plan:No
In-Place Species Management
  Harvest management plan:No
  Successfully reintroduced or introduced beningly:No
  Subject to ex-situ conservation:No
In-Place Education
  Subject to recent education and awareness programmes:No
  Included in international legislation:No
  Subject to any international management/trade controls:No
2. Agriculture & aquaculture -> 2.2. Wood & pulp plantations -> 2.2.1. Small-holder plantations
♦ timing: Past, Unlikely to Return ♦ scope: Minority (<50%) ♦ severity: Unknown ⇒ Impact score: Past Impact 
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

8. Invasive & other problematic species & genes -> 8.1. Invasive non-native/alien species -> 8.1.2. Named species (Cinnamomum verum)
♦ timing: Ongoing ♦ scope: Whole (>90%) ♦ severity: Unknown ⇒ Impact score: Unknown 
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

1. Research -> 1.3. Life history & ecology

Bibliography [top]

Gerlach, J. 2006. Terrestrial and Freshwater Mollusca of the Seychelles Islands. Backhuys, Leiden.

Gerlach, J., Matyot, P. and Samways, M.J. 2005. Developing strategies for invertebrate conservation, the case of the Seychelles islands. Phelsuma: 9-12.

IUCN. 2009. IUCN Red List of Threatened Species (ver. 2009.2). Available at: www.iucnredlist.org. (Accessed: 3 November 2009).


Citation: Gerlach, J. 2009. Edentulina moreleti. The IUCN Red List of Threatened Species 2009: e.T168142A6459016. . Downloaded on 26 July 2016.
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